Elexis' Scene Queen--rainbow'd (suggested by my Brony brother--and it looks ******* badass). It's not particularly re-colourable, however you can get some cool effects if you dink around with the tips. For best rainbow effect, the base hair pallet you would select would be blonde-ish or white.
I release this however I'm awaiting permission from Elexis to include
her mesh in the package, as there is no way in hell you'd be able to
have all 8 versions in game at once otherwise.
Both chopped and normal will have: rainbow, streaks, shine and streak+long tips.
If there are any other hairstyles you want streaked/rainbow'd lemme know; I take requests. :D